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Two capacitors, when connected in series, have an equivalent capacitance of 3 μF, and when they are connected in parallel their equivalent capacitance is 16 μF. Their values are respectively ______ μF and ______ μF.

Asked in GSEB Board March 2022 · Series and parallel combinations

Answer: (4) 4, 12

Step-by-step solution

Given: series value Cₛ = 3 μF, parallel value Cₚ = 16 μF.

Idea: Cₚ = C₁ + C₂ and Cₛ = (C₁C₂)/(C₁ + C₂), so C₁C₂ = Cₛ Cₚ.

So C₁ + C₂ = 16 and C₁C₂ = 3×16 = 48.

C₁ and C₂ are the roots of t² - 16t + 48 = 0, i.e. (t-4)(t-12) = 0.

Check: 4 + 12 = 16 and (4×12)/(16) = 3.

So the capacitors are 4 μF and 12 μF.

Why the other options are wrong

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